The European Space Agency says the Philae Probe's battery is now dead.

The probe made history last Wednesday by landing on the surface of a comet for the first time.

It was supposed to keep transmitting data for nine months, as it passed the sun, but the problem came when the probe landed on the comet's dark side.

That means the solar panels can't generate power.

Scientists say they're now no longer receiving transmissions from the probe, but there may still be hope.

The ESA hopes a rotation of the solar panels before the battery died may revive the probe later, but it's unclear when that would happen.